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to protect us from infections, like bacteria or viruses or parasites, but sometimes, it gets confused, and it starts recognizing foods as an enemy, and it starts mounting an immune response. >> that response can range from itching to rashes called hives, vomiting, even difficulty breathing. very severe symptoms are called anaphylaxis. anaphylaxis is not only scary -- it can be deadly, and it can happen in an instant. >> your throat closes. hives all over your body. your eyes puff up. it's different for everybody, really, but it gets really fatal. [ siren wails ] >> every 10 minutes, someone in the u.s. is rushed to the emergency room with a severe allergic reaction. what's more, food allergies are becoming more common. peanut allergies alone have tripled since our parents were kids. >> i have a friend who's allergic to almonds. >> my friends are allergic to nuts, berries, and milk. >> my best friend is allergic to peanuts. >> one of my friends, she's allergic to peanuts. [ mid-tempo piano music playing ] >> unfortunately, many people don't realize just how serious food allergies can b
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